took me a while, but i was able to move to 1.85 with root.
was on 1.73. used "Adb reboot-bootloader" then "fastboot oem lock" to relock. rebooted, ran the RUU for 1.85.
"adb reboot-bootloader" again, then flashed the unlock file from HTC dev. I had to flash this twice (each time selecting 'Yes' for voiding warranty), even though it seemed to complete the first time. Weird.
Rebooted, ran the one-click recovery that is available in this forum here: http://forum.xda-developers.com/show....php?t=1671873
After that, downloaded SU from http://forum.xda-developers.com/show....php?t=1538053
- use the CWM zip. Reboot into bootloader again, select Recovery to boot into CWM, then select the zip for SU. flashed this, rebooted.
bam!! took me a while but it worked out in the end.